Japan. (Netherlands). 1941. Envelope addressed to Japan bearing Holland Yvert 373, 12 1/2c ultramarine tied by Arnhem slogan '6th July 41' with hand-struck 'Zuruck ! Keine/ Beforderungsmoglichkeit (Return/ Back/ No Transport Possibility) with German censor tape tied by German censor cachet on reverse. Nice item of interrupted mail.
This German instructional not listed by 'Karl - Heinz Riemer' in his book on German censor labels and hand-struck cachets.